Slide-valve gear for steam-engines.



No. 724,989. Y PATENTED APR. '7, 1903.

. S. S. YOUNGHUSBAND.

SLIDE VALVE GEAR FOR STEAM ENGINES.

APPLICATION FILED PEB. 25. 1903.

UNiTnD Sarns arrivar einen@ SAMUEL SMITH YOUNGHUSBAND, OF DARLINGTON, ENGLAND, ASSIGNOR TO GILBERT CHARLES WARD, SR., OF NEWCASTLE, ENGLAND.

SLIDE-VALVE GEAR FOR STEAll/leENGlNES..

SPECIFICATION forming part of -Letters Patent No. 724,989, dated April 7, 1903. Application led February 25, 1903. Serial No.145,094. (No model.)

T @ZZ wwii/I/ t may O'wW: tached to the fixed axis t' by means of a pair Beit known that I, SAMUEL SMITH YOUNG- of swing carrier-linksj, which are pivotally HUSBAND, engineer, a subject of the King of connected atl to axially-alined gudgeons car- Great Britain, residing at Granville Terrace, ried by a pair of brackets lo, fixed to the out- 5 Woodlands Road, Darlington, in the county side of the duplex link d, the gudgeons Z beof Durham, England, have invented certain ing situated midway between the eccentricnewand useful Improvements in Slide-Valve rod centers g h and being in approximately Gear for Steam-Engines, of which the followaxial intersection with the longitudinal cening is a specification. ter line no of the link d. 6o xo My invention relates to slide-valve revers- The die-block m is duplex and consists of ing and expansion gear of the kind wherein a pair of members adapted to slide in the motion is transmitted from the expansion slots of the respective link members d, the and reversing link to the slide-valve through two die-block members m m being connected an intermediate lever which is pivoted to the by a cross-pin or gudgeon p, which forms r 5 die-block of the link and connected by its the pivotal connection of thelever o, through shorter arm or arms to the valve-rod, while which the oscillations of the dieblock are its other and longer arm is pivoted to an arm transmitted to the valve-rod n. The lever 0 or arms on the weigh-shaft, the expansion is fulcrumed at q to an arm or arms r on the and reversing linkvibrating as a whole about weigh-shaft s. It is continued beyond the 7o eo a fixed axis, to which it is connected by a pair cross-pin p of the die-block and is pivoted at of swing carrier-links, and the reversalof the its extremityt to the valve-rod n, which is engine being effected by moving the diethus caused to reciprocate through a greater block along the slot of the link. This type distance than if it were coupled direct to the of valve-gear, while specially designed to sedie-block. 25 cure durability, cheapness, and compactness, The expansion and reversing link d maybe gives a fixed amount of lead with all degrees curved in the direction shown or in the opof linking-up, a quick port-opening for the posite direction or may be made straight, admission of steam, a quick opening at the according to the position of the weigh-shaft, commencementof exhaust, anda much larger as will be readily understood by any one 8o 3o steam-port opening and more sudden cnt-off versed in the art of designing link-motions.

than ,usual for all degrees of linking-up, thus It is also to be observed that by suitably proenabling the engine to be always readily' portioning the length of the valve-rod n, the started. weigh-shaft arm r, and the valve-operating The invention is illustrated by way of exlever 0 the constancy of the lead given by 85 55 ample in the accompanying drawings, wberethis gear to the slide-valve in all positions of in the die-block may be maintained whatever Figures l and 2 are a side elevation and a the direction or degree of curvature given to sectional end elevation; and Fig. Sis adetail the expansion and reversing link. sectional view showing the general arrange- I claim- 9o 4o ment of the .improved gear as applied to a In engine slide-valve gear of the kind delocomotive havinginside cylinders and valvescribed, the combination of a duplex expanchests,the gear being in full forward position. sion and reversing link formed of a pair of The expansion and reversing link d is duparallel plates held apart by distance-pieces plex, being formed of two parallel slotted and having slots for the die-block in regis- 45 bars held apart by distance-pieces and bolts tration with one another; a duplex die-block or rivets, as at d. The link d is coupled to whereof the members are tted to slide in the the forward and backward eccentric-rods e f slots of the respective link members g, a pin by the pivotal joints or gudgeons g h, formed connecting and journaled in bearings in, the upon 'lugs situated at the back of each ofthe -die-block members; a valve-operating lever' roo 5o duplex link members and toward the ends pivoted about the axis of the said pin to work thereof. The link is supported by being atbetween the link members and pivotally connected at the one end to the slide-Valve rod center line of the link-slot, for the attach and at the other end to an arm on the Weighment of a pair of swing carrier-links, as de- 1o shaft; bracket-plates fixed to the outer faces scribed.

of the link members and straddling the slots thereof; and a pair of alined gudgeons carried by, and projecting from, said bracketplates in approximately axial intersection with the middle point of the longitudinal SAMUEL SMITH YOUNGHUSBAND.

Witnesses:

ARTHUR F. TAYLOR, W. H. GOLDING. 

